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3 liveuser 1 
<?php
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namespace Guzzle\Http\Message\Header;
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use Guzzle\Common\ToArrayInterface;
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/**
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 * Provides a case-insensitive collection of headers
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 */
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class HeaderCollection implements \IteratorAggregate, \Countable, \ArrayAccess, ToArrayInterface
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{
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    /** @var array */
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    protected $headers;
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    public function __construct($headers = array())
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    {
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        $this->headers = $headers;
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    }
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    public function __clone()
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    {
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        foreach ($this->headers as &$header) {
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            $header = clone $header;
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        }
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    }
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    /**
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     * Clears the header collection
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     */
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    public function clear()
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    {
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        $this->headers = array();
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    }
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    /**
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     * Set a header on the collection
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     *
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     * @param HeaderInterface $header Header to add
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     *
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     * @return self
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     */
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    public function add(HeaderInterface $header)
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    {
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        $this->headers[strtolower($header->getName())] = $header;
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        return $this;
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    }
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    /**
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     * Get an array of header objects
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     *
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     * @return array
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     */
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    public function getAll()
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    {
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        return $this->headers;
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    }
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    /**
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     * Alias of offsetGet
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     */
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    public function get($key)
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    {
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        return $this->offsetGet($key);
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    }
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    public function count()
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    {
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        return count($this->headers);
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    }
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    public function offsetExists($offset)
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    {
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        return isset($this->headers[strtolower($offset)]);
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    }
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    public function offsetGet($offset)
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    {
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        $l = strtolower($offset);
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        return isset($this->headers[$l]) ? $this->headers[$l] : null;
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    }
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    public function offsetSet($offset, $value)
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    {
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        $this->add($value);
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    }
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    public function offsetUnset($offset)
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    {
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        unset($this->headers[strtolower($offset)]);
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    }
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    public function getIterator()
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    {
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        return new \ArrayIterator($this->headers);
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    }
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    public function toArray()
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    {
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        $result = array();
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        foreach ($this->headers as $header) {
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            $result[$header->getName()] = $header->toArray();
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        }
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        return $result;
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    }
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}